Can I send a Notice of Intent with the balance of our contract, even though we've not completed portions of the work?

I'm a sub working on a Nat'l Guard base, for a large GC in NC. Other subs are having problems with the GC, both getting paid and cooperation. They've left the site multiple times. We are about to start on-site, but it's delayed due to the site is not ready as the GC stated, and now have material stored on site. We've been paid some of the contract for past efforts/matl,, but not all. We've sent the Prelim Notice of Miller act previously and would like to send the Intent letter as we've no faith in the performance of the GC. Am I able to list the balance of the contract amount, even though we've not done all of the work yet?